Manually operable electric curtain

Details Manually operable electric curtain Manually operable electric curtain

1988-03-17

1989-04-11

Britts, Ramon S.

Flexible or portable closure, partition, or panel

Hanging or drape type

Motor operating means or electric or fluid pressure control

74626, A47H 500

Patent

active

048197084

ABSTRACT:
A manually and automatically operable curtain is provided with an electric motor, a planetary gearing of which the sun gear is fixed to the output shaft of the motor, a driven gear engageable with the planet gear of the planetary gearing, a cord pulley fixed to the driven gear for drawing the curtain, and an electric control system including a motor-reversing device. The rotation of the motor is transmitted to the cord pulley through the intermediary of the planet gear when the motor turns. Responsive to a signal to stop the motor, the motor-reversing device reverses the motor for a very small time so as to disengage the planet gear from the driven gear. Thus, the curtain is easily operated by hand without receiving the rotational resistance of the motor.

REFERENCES:
patent: 2621542 (1949-09-01), Rath
patent: 3136358 (1963-07-01), Madsen
patent: 3561520 (1971-02-01), Gill
patent: 3672425 (1972-06-01), Schulze-Robbecke et al.
patent: 4031944 (1977-06-01), Morrison et al.
patent: 4392392 (1983-07-01), Perisic et al.
patent: 4437506 (1984-03-01), Ogita
patent: 4573723 (1986-03-01), Morita et al.

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